One of the common refrigeration systems in use today is the vapor compression cycle. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapourcompression refrigerators when employing refrigerant r11, r12, r22 or r502. Thermodynamic calculations of twostage vapor compression. Vapor compression can lift large heat loads and can heat sink at below ambient temperatures. Example use the refrigerant4a tables 1 1 1 1 1 238. Other systems employed are gas refrigeration, vapor. Vapor compression type refrigeration free download as powerpoint presentation. Simply stated, refrigeration systems efficiently move heat from a cold source to a hot heat sink normally air.
This application is for thermodynamic calculations of vapor compression refrigeration cycle with regeneration. It is also used in domestic and commercial refrigerators, largescale warehouses for. According to the results of their experiments, the refrigerant r290r600a had a refrigerating capacity 28. Some basic refrigeration cycles are discussed here through different diagrams. Mathematical model description for vapor compression.
The compressor drives the r4a refrigerant through a condenser, an expansion valve, and an evaporator. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Module 03 vapor compression refrigeration refrigeration. Thermodynamic calculations of vapor compression refrigeration.
Improving the accuracy and scope of controloriented vapor. Vapor compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail. The advantages of the optimized refrigeration design are highlighted, establishing a performance vs.
Refrigerant r22 vapor enters a positive displacement compressor at a slightly superheated state 1 and is then compressed to state 2. The vapor compression refrigeration cycle download pdf download pdf to view pdf, download here open mechanical engineering hvac. Textbook of refrigeration and airconditioning written by r. This example models a vaporcompression refrigeration cycle using twophase fluid components.
Lesson 10 vapour compression refrigeration systems 1 version 1 me, iit kharagpur the specific objectives of the lesson. The above figure shows the objectives of refrigerators and heat pumps. Layout of the r22 vapourcompression refrigeration system. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. Refrigerant4a is the working fluid in an ideal compression refrigeration cycle. Vapor compression refrigeration system basic, working. Pdf textbook of refrigeration and airconditioning by r. Ts diagram of simple vapor compression refrigeration cycle figure 6. The vapor compression refrigeration cycle, step by step.
A reversible, adiabatic isentropic compression of the refrigerant. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Pdf recent developments in vapor compression systems or small. Miniature vapor compression refrigeration system for electronics. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats.
The process of refrigeration uses the vapor compression refrigeration cycle to move heat from one place to another. These are the evaporator, condenser, compressor and the expansion valve. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. Jan 31, 2018 may 03, 2017 refrigeration and air conditioning by arora and domkundwar pdf. Dynamic grey box modeling for vapor compression cycle systems. The process of refrigeration uses the vaporcompression refrigeration cycle to move heat from one place to another. In the previous lesson, we learned that the carnot vapor compression refrigeration cycle had two problems that made it impractical. Vapor compression cooling systems can be used for refrigeration and dehumidification. In the past, this was done by collecting ice in the winter and using its specific heat to cool as the ice melted. Vapor compression an overview sciencedirect topics. At the bottom of the articles you can download pdf. After the refrigerant vapor is compressed it is discharged to the condenser coil.
Vapour compression refrigeration or vapor compression refrigeration system,1 in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. The compressor does work on the refrigeration system consumes energy. From 2 the high pressure high temperature vapour is first sensibly cooled to saturation, then condensed and ultimately sub. Recent advances in vapor compression cycle technologies pdf. Vapourcompression refrigeration or vaporcompression refrigeration system,1 in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Vaporcompression cycle refrigeration is a process that uses the physics of phase change heat transfer and the unique properties of a refrigerant to transfer heat from a relatively cold source to a hot medium. A simple vapor compression refrigeration system consists of the following equipments. Recent developments in simulation techniques for vapour. Schematic of a vapour compression refrigeration cycle is shown in fig.
It is also used in domestic and commercial refrigerators, largescale. The refrigerant leaves the evaporator at 20oc and has a condenser pressure of 0. It is necessary for the evaporator to supply the compressor with vapor refrigerant as it is impossible to compress a liquid. Find cop r and cop r, carnot for the same t max and t min, and the tons of refrigeration. Apr 23, 2020 in any refrigeration process, heat is transferred from one region to another with the aid of an external agent.
Pdf performance analysis of a combined vapor compression. While vaporcompression technologies have served heating, ventilation, and airconditioning hvac needs very effectively, and have been the dominant hvac technology for close to 100 years, the conventional refrigerants used in vaporcompression equipment contribute to global climate change when released to the atmosphere. Pdf constructal vapor compression refrigeration vcr systems. In the vapor compression refrigeration system, which is widely used, the external agent is a compressor. Vapourcompression refrigeration systems sciencedirect. Refrigeration cycle is the basis of all refrigeration systems. The vapor compression refrigeration cycle involves four components. From 2 the high pressure high temperature vapor is first sensibly cooled to saturation, then condensed and ultimately subcooled to state 3.
Khurmi is very useful for mechanical engineering mech students and also who are all having an interest to develop their knowledge in the field of design, automobile, production, thermal engineering as well as all the works related to mechanical field. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapour compression refrigerators when employing refrigerant r11, r12, r22 or r502. The cooling coefficient of performance cop for air conditioning under normal conditions is. Refrigerants for vapour compression refrigeration systems. Refrigeration systems and applications, second edition. Other systems employed are gas refrigeration, vapor absorption refrigeration, and vortex refrigeration. Heat losses and gains over the compressor, condensor, throttle and evaporator will be calculated, together with the coefficient of performance. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. Refrigeration and air conditioning pdf notes rac pdf notes. This application is for thermodynamic calculations of.
When 1 pound of ice melts, it absorbs 144 btu, as latent energy. Refrigeration air conditioning c p arora third edtn ebook download as pdf, text or read refregeration reader android pdf and air conditioning by c p arora. All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. Classification of refrigeration methods based on type of the variation of pressure and flow rate in the cycle during steadystate op eration. In many hvac air conditioner and heat pump applications, the process of refrigeration or the vapor compression cycle is what makes it work. Difference between vapour compression and vapour absorption pdf. In the vaporcompression refrigeration system, which is widely used, the external agent is a compressor. Thermodynamic calculations of twostage vapor compression refrigeration cycle with flash chamberregenerative intercooler you can switch back to the summary page. It raises the pressure, temperature and enthalpy of the refrigerant by compressing the saturated gas, in an isentropic process, to a superheated. Additionally, the thermodynamic cycle will be plotted on a pressureenthalpytemperature chart. The evaporating temperature is 25 oc and condensing temperature 47 oc. System description the layout of the system is shown in figure 1.
Determination of a vapor compression refrigeration system. Vapor compression refrigeration hvacr heat pumps air. Vapor compression cooling for high performance applications. By araner posted 20180223 in refrigeration the vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Ph diagram for simple vapor compression refrigeration cycle. Apr 02, 2016 vapour compression refrigeration system 1. Simple vapor compression refrigeration cycle it is shown on ts below at point 1, let t 1, p 1, and s 1 be the properties of vapour refrigerant. It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings. Schematic diagram a and photographs b of the experimental apparatus. Energetic and exergetic anal yses are conducted on the thermodynamic performances of this system with co 2. Natural gas plants, petroleum refineries, and petrochemical plan. Vaporcompression evaporation is the evaporation method by which a blower, compressor or jet ejector is used to compress, and thus, increase the pressure of the vapor produced. In many hvac air conditioner and heat pump applications, the process of refrigeration or the vaporcompression cycle is what makes it work.
Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator submitted by seyfettin yildiz in partial fulfillment of the requirements for the degree of master of science in mechanical engineering department, middle east technical university by, prof. Before moving further on differences lets have an overview of both the vapour compression and vapour absorption refrigeration system. Typical vapor compression systems can be represented as shown in figure. Before moving further on differences lets have an overview of both the vapour compression.
A proposed hybrid vapor compression refrigeration system hvcr is proposed in this paper. A compressor which compresses the vaporous working fluid. Analysis of a vaporcompression refrigeration cycle maplesoft. The refrigeration capacity is 8 tr and the compression is. Ch 10, lesson b, page 1 practical vaporcompression refrigeration cycles. Vapour compression refrigeration system linkedin slideshare. Layout of the r22 vapour compression refrigeration system. Khurmi by textbook of refrigeration and airconditioning.
So refrigeration cycle should be known to understand the refrigeration system. It can be used whenever a refrigeration or airconditioning requirement occurs. It is a compression process, whose aim is to raise the refrigerant pressure, as it. Electricity purchased from utility companies for conventional vapor compression refrigerators can be reduced. A performance comparison of vapour compression refrigeration. Vapour compression refrigeration is the primary method to provide mechanical cooling. Dec 31, 2016 vapour compression refrigeration system 1. Determination of a vapor compression refrigeration system refrigerant charge. Vapor compression refrigeration is being adapted to cool computer and telecommunications equipment in a limited number of high performance applications.
This example models a vapor compression refrigeration cycle using twophase fluid components. Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. How vaporcompression cooling works electronics cooling. The use of heat operated refrigeration systems help reduce problems related to global environmental, such as the so called greenhouse effect from co2 emission from the combustion of fossil fuels in utility power plants. Air conditioning and refrigeration download as pdf file. Refrigerant r22 vapour enters a positive displacement compressor at a slightly superheated state 1 and is then compressed to state 2.
The ideal refrigeration cycle is considered with the following conditions. In r and r15,8units of r09 syllabus are combined into 5units in r and r15 syllabus. In the previous lesson, we learned that the carnot vaporcompression refrigeration cycle had two problems that made it impractical. Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2. Ts and ph diagrams for an ideal vaporcompression refrigeration cycle. Both compressors and turbines work better when the working fluid is all in just one phase. Vaporcompression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. These notes are according to the r09 syllabus book of jntu. Refrigeration and air conditioning by arora and domkundwar pdf. A compressor which compresses the vaporous working fluid and providing required mechanical energy, 9 6, to the system. Both a steadystate and a transient simulation will be considered.
Additionally, the thermodynamic cycle will be plotted on a pressureenthalpy temperature chart. Vapour compression units are the most widely used refrigeration systems. Vaporcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. If you have any doubts please refer to the jntu syllabus book. Layout of the r22 vaporcompression refrigeration system.
The internal heat exchanger, by increasing the enthalpy and temperature of the pre compression refrigerant, assists in ensuring that a superheated vapor with no liquid droplets enters the compressor. Vapour compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. The hot gas leaving the compressor condenses in the condenser via heat transfer to the environment. Refrigeration and air conditioning pdf notes rac pdf notes file to download are listed below please check it note. Vapourcompression units are the most widely used refrigeration systems. Setup and function of a compression refrigeration system. The refrigerant in a compression refrigeration system flows through a closed cycle with the following. Pdf vapour compression refrigeration system generating. Module 03 vapor compression refrigeration free download as powerpoint presentation. A compressor is an essential component in the vapor compression process of refrigeration. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. The internal heat exchanger, by increasing the enthalpy and temperature of the precompression refrigerant, assists in ensuring that a superheated vapor with no liquid droplets enters the compressor.
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